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Gift Card Incentives and Non-Response Bias in a Survey of Vaccine Providers: The Role of Geographic and Demographic Factors
- Joshua Van Otterloo,
- Jennifer L. Richards,
- Katherine Seib,
- Paul Weiss,
- Saad B. Omer
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- Published: November 23, 2011
- https://doi.org/10.1371/journal.pone.0028108